As with all PowerFrameworks puzzle pieces, the interior of the puzzle
piece is large enough to hold text or graphic content. PowerFrameworks
puzzles are unique in this manner – engineered and developed to be
useful as a message delivery vehicle.

This series and sg026 offer expanded possibilities for puzzles. If
you need very large puzzle boards or unlimited pieces, this series and
sg026 are the correct choice. These puzzle pieces have been drawn so
that rows and columns can be added, creating unlimited possibilities.

Basically, there are only two types of rows so the puzzles can be expanded very easily. See the tutorial. Same with columns.

Another
idea is to string a horizontal line of puzzle pieces and use them to
show adding or building interconnected pieces in sequence. Horizontal
flows are typically used for this, but the string of puzzle pieces
sends a distinct message.

Notice that each piece type has its
own color. This makes it easy to add border pieces if needed. Refer
to the tutorial if you need further explanation. Also, the
downloadable animation example is especially good – don't forget to
check it out.